Regencell Bioscience shares fall more than 12% premarket after two-day rally
** Shares of biotech company Regencell Bioscience RGC.O fall 12.2% in premarket trading ** Stock has quintupled in the past two trading sessions after its stock split kicked in ** It announced a 38-for-one forward stock split on June 2 ** RGC develops traditional Chinese medicine for the treatment of neurocognitive disorders ** RGC's stock was priced at 13 cents at the beginning of 2025 (Reporting by Ateev Bhandari in Bengaluru) ((Ateev.Bhandari@thomsonreuters.com;))